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Commitments, Contingencies and Other Items Commitments, Contingencies and Other Items (Leases) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Lessee, Lease, Description [Line Items]    
Operating lease, weighted average lease term 1 year 7 months 6 days  
Operating lease, right-of-use asset $ 20.5  
Operating lease, liability 20.5  
Operating lease, expense $ 1.7  
Lessee, operating lease, term of contract 20 years  
Lessee, operating lease, renewal term 30 years  
Other assets    
Lessee, Lease, Description [Line Items]    
Finance lease, right-of-use asset $ 20.4  
Other liabilities    
Lessee, Lease, Description [Line Items]    
Finance lease, liability 25.7  
Other Operating Income (Expense), Net    
Lessee, Lease, Description [Line Items]    
Finance lease, interest expense 0.6 $ 0.7
Finance lease, right-of-use asset, amortization $ 0.2 $ 0.5